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bhavinraval_08
Active Contributor

Join Date: Jun 2009
Location: gujarat, India
Posts: 17

Protection With CBCT

08/24/2009 2:10 AM

I want to protect one small transformer. for that i installed fuse for O/C protection and for ground fault i want to use CBCT (core balance current transformer). when e/f occur and trip command trip the Load brake switch (with trip coil). Now how can i select a ratio of CBCT? how coordination is done with other e/f device.
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PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Protection With CBCT

08/24/2009 5:03 AM

<...one small transformer...>

What rating?

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bhavinraval_08
Active Contributor

Join Date: Jun 2009
Location: gujarat, India
Posts: 17
#2
In reply to #1

Re: Protection With CBCT

08/25/2009 12:05 AM

Transformer rating is 5MVA, 22/6.6kV.
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